Feeding out of the enclosure in a separate container is very old school. It was believed that only breeders fed in the enclosure because of the time it would take to feed a very large collection out of enclosure. Some also believed it would cause the snake to associate anything coming into with tank as food. Turns out, it works better feeding them in the enclosure. This is why so many recommend it, myself included. It is easy on all involved. The snake, the keeper, less chance of getting bitten or stressing out the animal with a possible chance of regurgitating. Trust me, I feed out of cage way too long, with a very large boa collection. Oh it can definitely be done, but why when it’s just better for the whole situation to just feed in cage. 😉